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Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Jan. 01, 2020	Dec. 31, 2019 USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current	$ 12,870		$ 11,822
Other current receivables	12,534		9,640
Goodwill, Impairment Loss	0
Impairment of Intangible Assets (Excluding Goodwill)	0
Other Liabilities, Current	$ 20,392		14,595
Number Of Days Notice Required To Cancel Health Insurance Contract	30
Healthcare Sector [Member]
Health Insurance Industry Tax	$ 3,000
Other Current Liabilities [Member]
Health savings account deposits	$ 10,200		8,300
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Plan Award, Options, Award Exercisable Period	10 years
Employee Stock Purchase Plan (ESPP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	10.00%
Accounting Standards Update 2016-13
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]		true
Health Insurance Product Line [Member]
Short-duration Insurance Contracts, Historical Claims Duration, First 90 Days	0.90
Products and services [Member]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 5,300		4,300
Pharmaceutical Manufacturer Rebates Receivable [Member]
Other current receivables	6,300		4,700
Medicare Part D Receivables [Member]
Other current receivables	$ 2,900		$ 2,300

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